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Song Y.,Research Institute of the Dushanzi Petrochemical Company | Song Y.,Shanghai Institute of Technology | Song Y.,Shanghai JiaoTong University | Han S.,Shanghai Institute of Technology | And 2 more authors.
Petroleum Science and Technology | Year: 2010

The alkyl methacrylate-maleic anhydride copolymer (RMC-MA) is widely used as a pour point depressant (PPD). In order to develop more efficient RMC-MA, it is necessary to study the crystallization behavior of n-alkanes when adding RMC-MA to diesel fuel. In this study, RMC-MA was prepared by the reaction of long-chain alkyl methacrylate and maleic anhydride. The simulated diesel fuel before and after adding C14MC-MA were filtered at the cold filter plugging point (CFPP) in a manual CFPP apparatus. Extensive measurements of the variation of the composition of n-alkanes were done by gas chromatography and the results were compared. The experimental results show that the recovery ratios of the simulated diesel fuel and fuel with additive are 98.6 and 98.1%, respectively; and the distribution of the concentrations of n-alkanes in the filtrate is basically similar to that of the simulated fuel. The distribution of concentrations of n-alkanes in the precipitate exhibits a slight decrease in the concentration of low carbon number n-alkanes concomitant with an increase in the concentration of high carbon number n-alkanes; The crystallinity of n-alkanes in simulated diesel fuel and fuel with additive increase with an increase of n-alkanes number. With the C14MC-MA copolymers added into simulated diesel fuel, the crystallinity of octadecane and eicosane began to decline, and n-alkanes with carbon number from 12 to 16 show a tiny increased trend.

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